package com.bjx.gateway.config;

import com.alibaba.nacos.common.utils.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.Route;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.config.ResourceHandlerRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import reactor.core.publisher.Flux;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;
/**
 * swagger微服务聚合
 * @author: liushuai
 * @date: 2022/6/30 21:45
 */
@Component
@Primary
public class BjxSwaggerProvider implements SwaggerResourcesProvider {
    public static final String API_URI = "/v2/api-docs";
    @Autowired
    private  RouteLocator routeLocator;
    @Autowired
    private  GatewayProperties gatewayProperties;


    public BjxSwaggerProvider() {
    }

    @Override
    public List<SwaggerResource> get() {
        List<SwaggerResource> resources = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        // 取出gateway的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        // 结合配置的route-路径(Path)，和route过滤，只获取在枚举中说明的route节点
        gatewayProperties.getRoutes().stream().filter(routeDefinition -> routes.contains(routeDefinition.getId()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        // 目前只处理Path断言  Header或其他路由需要另行扩展
                        .filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
                        .forEach(predicateDefinition -> {

                            resources.add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
                                    .get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", API_URI)));

                                }
                        ));
        return resources;
    }

    private SwaggerResource swaggerResource(String name, String location) {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("3.0");
        return swaggerResource;
    }

}
